18028440 has 64 divisors (see below), whose sum is σ = 60098400. Its totient is φ = 4807296.

The previous prime is 18028433. The next prime is 18028447. The reversal of 18028440 is 4482081.

It is an interprime number because it is at equal distance from previous prime (18028433) and next prime (18028447).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18028447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7267 + ... + 9426.

Almost surely, 2^18028440 is an apocalyptic number.

18028440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18028440 is an abundant number, since it is smaller than the sum of its proper divisors (42069960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18028440 is a wasteful number, since it uses less digits than its factorization.

18028440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16713 (or 16703 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 18028440 is about 4245.9910503909. The cubic root of 18028440 is about 262.2120925045.

The spelling of 18028440 in words is "eighteen million, twenty-eight thousand, four hundred forty".